HVAC system display screen or portion thereof with graphical user interface



FIG. 1 is a front view of a first embodiment of an HVAC system display or portion thereof with graphical user interface showing the claimed design;

FIG. 2 is a front view of a second embodiment thereof; and,

FIG. 3 is a front view of a third embodiment thereof.

The outermost broken line in the figures shows an HVAC system display screen or portion thereof, and forms no part of the claimed design. The remaining broken lines in the figures showing portions of the graphical user interface form no part of the claimed design. 

CLAIM The ornamental design for an HVAC system display screen or portion thereof with graphical user interface, as shown and described. 